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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2012 Zhenya Leonov<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.palamida.util.base;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.base.Objects;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/**<a name="line.21"></a>
<span class="sourceLineNo">022</span> * A container of two possibly {@code null} objects.<a name="line.22"></a>
<span class="sourceLineNo">023</span> * &lt;p&gt;<a name="line.23"></a>
<span class="sourceLineNo">024</span> * A convenience class, similar to the Pair class in the C++ STL library, most<a name="line.24"></a>
<span class="sourceLineNo">025</span> * commonly used for storing and passing pairs of objects.<a name="line.25"></a>
<span class="sourceLineNo">026</span> * <a name="line.26"></a>
<span class="sourceLineNo">027</span> * @author Zhenya Leonov<a name="line.27"></a>
<span class="sourceLineNo">028</span> * @param &lt;T&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span> *            The type of the first object<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @param &lt;U&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> *            The type of the second object<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span>public abstract class Pair&lt;T, U&gt; {<a name="line.33"></a>
<span class="sourceLineNo">034</span>        private T first;<a name="line.34"></a>
<span class="sourceLineNo">035</span>        private U second;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>        /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>         * Creates a new {@code Pair} of objects.<a name="line.38"></a>
<span class="sourceLineNo">039</span>         * <a name="line.39"></a>
<span class="sourceLineNo">040</span>         * @param first<a name="line.40"></a>
<span class="sourceLineNo">041</span>         *            the first object<a name="line.41"></a>
<span class="sourceLineNo">042</span>         * @param second<a name="line.42"></a>
<span class="sourceLineNo">043</span>         *            the second object<a name="line.43"></a>
<span class="sourceLineNo">044</span>         */<a name="line.44"></a>
<span class="sourceLineNo">045</span>        public Pair(final T first, final U second) {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                this.first = first;<a name="line.46"></a>
<span class="sourceLineNo">047</span>                this.second = second;<a name="line.47"></a>
<span class="sourceLineNo">048</span>        }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>        /**<a name="line.50"></a>
<span class="sourceLineNo">051</span>         * Returns the first object.<a name="line.51"></a>
<span class="sourceLineNo">052</span>         * <a name="line.52"></a>
<span class="sourceLineNo">053</span>         * @return the second object<a name="line.53"></a>
<span class="sourceLineNo">054</span>         */<a name="line.54"></a>
<span class="sourceLineNo">055</span>        public T getFirst() {<a name="line.55"></a>
<span class="sourceLineNo">056</span>                return first;<a name="line.56"></a>
<span class="sourceLineNo">057</span>        }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>        /**<a name="line.59"></a>
<span class="sourceLineNo">060</span>         * Sets the first object.<a name="line.60"></a>
<span class="sourceLineNo">061</span>         * <a name="line.61"></a>
<span class="sourceLineNo">062</span>         * @param first<a name="line.62"></a>
<span class="sourceLineNo">063</span>         *            the first object<a name="line.63"></a>
<span class="sourceLineNo">064</span>         */<a name="line.64"></a>
<span class="sourceLineNo">065</span>        public abstract void setFirst(final T first);<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>        /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>         * Sets the second object.<a name="line.68"></a>
<span class="sourceLineNo">069</span>         * <a name="line.69"></a>
<span class="sourceLineNo">070</span>         * @param second<a name="line.70"></a>
<span class="sourceLineNo">071</span>         *            the second object<a name="line.71"></a>
<span class="sourceLineNo">072</span>         */<a name="line.72"></a>
<span class="sourceLineNo">073</span>        public abstract void setSecond(final U second);<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>        /**<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * Returns the second object.<a name="line.76"></a>
<span class="sourceLineNo">077</span>         * <a name="line.77"></a>
<span class="sourceLineNo">078</span>         * @return the second object<a name="line.78"></a>
<span class="sourceLineNo">079</span>         */<a name="line.79"></a>
<span class="sourceLineNo">080</span>        public U getSecond() {<a name="line.80"></a>
<span class="sourceLineNo">081</span>                return second;<a name="line.81"></a>
<span class="sourceLineNo">082</span>        }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>        @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>        public int hashCode() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>                return Objects.hashCode(first, second);<a name="line.86"></a>
<span class="sourceLineNo">087</span>        }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>        @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span>        public boolean equals(final Object obj) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>                if (this == obj)<a name="line.91"></a>
<span class="sourceLineNo">092</span>                        return true;<a name="line.92"></a>
<span class="sourceLineNo">093</span>                if (obj == null)<a name="line.93"></a>
<span class="sourceLineNo">094</span>                        return false;<a name="line.94"></a>
<span class="sourceLineNo">095</span>                if (getClass() != obj.getClass())<a name="line.95"></a>
<span class="sourceLineNo">096</span>                        return false;<a name="line.96"></a>
<span class="sourceLineNo">097</span>                final Pair&lt;?, ?&gt; other = (Pair&lt;?, ?&gt;) obj;<a name="line.97"></a>
<span class="sourceLineNo">098</span>                return Objects.equal(first, other.first) &amp;&amp; Objects.equal(second, other.second);<a name="line.98"></a>
<span class="sourceLineNo">099</span>        }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>        @Override<a name="line.101"></a>
<span class="sourceLineNo">102</span>        public String toString() {<a name="line.102"></a>
<span class="sourceLineNo">103</span>                return Objects.toStringHelper(this).add("first", first).add("second", second).toString();<a name="line.103"></a>
<span class="sourceLineNo">104</span>        }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>}<a name="line.106"></a>




























































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